Open Access
Table 6
Experimental parameters used for closed-loop experiments with the iMZ.
| Experimental parameters | ||
| iMZ WFS | λ/D pinhole, 30/70 beam splitter | |
| WFS wavelength | 632 nm | |
| Corrector | 12 × 12 MEMS DM (surface: 4.4 × 4.4 mm2; pitch: 400 µm; stroke (1 actuator): 2.7 µm; coupling: 13%) | |
| Controller | Integrator with gain g = 0.3 | |
| Pre-corrected modes | Piston, tip, and tilt | |
| VLT equiv. | Bench | |
| Turbulence | Atmosphere | 512 × 512 SLM |
| Pupil diameter | 8m | 4 mm (1100 pixels) |
| dact | 80 cm | 400 µm (110 pixels) |
| r0 (0.6 µm) | 50 cm | 69 pixels |
| L0 | 30 m | 4125 pixels |
| vwind | 1.7 m/s | 0.25 pixel/frame |
| Coherence time | 94 ms | 94 s |
| Frame frequency | 1 kHz | 1 Hz |
| Loop frequency | 3 Hz | ≈0.33 Hz |
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